Admin's aware of the problem and we're working with archive - meaning, we're prodding them with long sticks and mean emails - to fix it.

It appears to be mainly a display problem due to some change in archive's derive process (or something else). It occurred some time last week and since then we're trying to get archive to fix it.

In case somebody noticed: This is also the reason why some admins are holding off cataloging: mostly as to not create more work for us and/or archive when archive goes back to normal... (yes, we are that lazy... )

A temporary solution: don't play them in the Archive player, but download the files and play them directly off one's computer.

It's a problem, but it's not a major problem unless you use the Archive built-in player. Archive is aware of it and is working on it (how diligently we do not know, I guess), but we don't have a timeline for a solution, and we don't want to nag them.

I noticed - it was fine when I posted, must have just been waiting in a queue to rederive after I had added the cover .They are different files , one lot are our 128kb fixed bitrate files , the other are variable bitrate.

They are Archive pages - they can actually show things any way they like . They don't tell us what to do, we don't tell them
But they are being very helpful - it takes a while to work out what happens . They have already changed the image display for us , and the "double" issue when files are first uploaded https://archive.org/details/poemas_1701_librivox , it's just secondary derives that are causing the pages to look odd and I am confident they will be done to our satisfaction, all these things take time to do properly